Separate Power Allocation and Control Method Based on Multiple Power Channels for Wireless Power Transfer

A Generalized Methodology to Generate, Amplify and Compensate Multi-Frequency Power for a Single-Inverter-Based MF-MR-S-WPT System

“…The multi-resonant tank and MF compensation tank are used to amplify and compensate the MF power components, respectively. Although the literatures [12], [16], and [17] have introduced the design method of multi-resonant tank, they require the complicated multiple harmonic analysis and does not have generality. The proposed designed method is based on circuit synthesis theory, leading to a relatively easy and more generalized task.…”

“…According to the number of inverters being used, these methods can be classified into two types: multi-inverterbased method [11]- [13] and single-inverter-based method [14]- [19]. In multi-inverter-based method, the multiple inverters are operating at different switching frequencies and can be connected to individual transformers [11], [12] or multiple transmitting coils [13] to combine MF power from transmitter to receivers. Based on this method, the power of different receivers can be controlled independently by changing the duty cycles of corresponding inverters [12].…”

“…In multi-inverter-based method, the multiple inverters are operating at different switching frequencies and can be connected to individual transformers [11], [12] or multiple transmitting coils [13] to combine MF power from transmitter to receivers. Based on this method, the power of different receivers can be controlled independently by changing the duty cycles of corresponding inverters [12]. However, the use of multiple inverters may increase system complexity and generate unexpected power losses.…”

“…As a result, only the selective receiver with same resonant frequency can get power and thus a simultaneous WPT cannot be achieved. To provide more resonant frequencies, a multi-resonant transmitting tank composed of multiple LC topologies is designed in [12], [16] and [17]. The multi-resonant tank is able to extract and amplify the power of different frequencies.…”

“…Further, in [16] and [17], the reactive component at each resonant frequency is eliminated by adding a compensation tank between the multi-resonant tank and transmitting coil. However, in [12], [16] and [17], only the design process of multi-resonant transmitting tank for the case with two receivers is introduced in detail and their design methods are complicated because the multiple harmonic analysis is required. Hence, there is still a lack of simple and general design method of multi-resonant transmitting tank which can amplify and compensate the MF power components for applications with arbitrary multiple receivers.…”